Add SPDX license identifier

NOTICE

@@ -1,2 +1,12 @@
-OpenSearch PerformanceAnalyzer
-Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+OpenSearch
+Copyright 2021 OpenSearch Contributors
+
+This product includes software developed by
+Elasticsearch (http://www.elastic.co).
+Copyright 2009-2018 Elasticsearch
+
+This product includes software developed by The Apache Software
+Foundation (http://www.apache.org/).
+
+This product includes software developed by
+Joda.org (http://www.joda.org/).

gradle.properties

@@ -1,14 +1,3 @@
-#
-# SPDX-License-Identifier: Apache-2.0
-#
-# The OpenSearch Contributors require contributions made to
-# this file be licensed under the Apache-2.0 license or a
-# compatible open source license.
-#
-# Modifications Copyright OpenSearch Contributors. See
-# GitHub history for details.
-#
-
 # The following 3 properties are used for integration testing with OpenSearch
 # The "enablePaAndRca" gradle task in the performance-analyzer-rca repository contains logic to spin up a 2-node
 # OpenSearch cluster with the PA and RCA components enabled. The cluster endpoint for this cluster is localhost:9300

license-header

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright $YEAR Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/OpenSearchResources.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/PerformanceAnalyzerPlugin.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/action/PerformanceAnalyzerActionFilter.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/action/PerformanceAnalyzerActionListener.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/action/RequestType.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/AdmissionControlMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/CacheConfigMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/CircuitBreakerCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/ClusterApplierServiceStatsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/ElectionTermCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/FaultDetectionMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/MasterServiceEventMetrics.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/MasterServiceMetrics.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/MasterThrottlingMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/NodeDetailsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/NodeStatsAllShardsMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2020-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/NodeStatsFixedShardsMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/ShardIndexingPressureMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/ShardStateCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/ThreadPoolMetricsCollector.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/collectors/ValueCalculator.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2019-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/config/PerformanceAnalyzerController.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *

src/main/java/com/amazon/opendistro/opensearch/performanceanalyzer/config/setting/ClusterSettingListener.java

@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 /*
  * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  *